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<b>GridSphere Service Provider Interface (SPI) API</b>
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All interfaces in this Service Provider Interface (SPI) package are
needed by all implementations of services.
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The key interfaces included in the SPI API are:
<ul>
<li>{@link org.gridsphere.portlet.service.spi.PortletServiceFactory}
 - provides a service factory interface</li>
<li>{@link org.gridsphere.portlet.service.spi.PortletServiceConfig}
 - provides a service configuration interface</li>
 <li>{@link org.gridsphere.portlet.service.spi.PortletServiceProvider}
 - provides a service provider interface for service initialization and shutdown</li>
 </ul>
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